**Job Description:** \\We are looking for a Backend Developer/Tools Engineer with strong experience in APIs and integrations to build the tools used by our AI agents. You will create external functions, services, connectors, and business logic that enable the agent to perform calculations, queries, validations, audits, and automations securely and efficiently. **Responsibilities:** \\Develop and maintain tools for agents: APIs, microservices, functions, and automations; \\Build connectors for legacy systems, databases, ERPs, and external services; \\Implement services for technical calculations, validations, analyses, OCR, and data transformations. \\Create secure and optimized endpoints for execution via agent (tool calling); \\Build multi-step logic to support agent reasoning; \\Implement logging, traceability, auditing, and telemetry for tools; \\Create tests and automations to ensure service robustness and reliability; \\Collaborate with AI and RAG engineers on tool and pipeline integration; \\Optimize tool performance, security, and operational cost. **Other Requirements and Qualifications, Tools, Skills, Courses, and Certifications:** \\Solid backend experience (Python or Node.js); \\Proficiency in REST APIs, enterprise integrations, lightweight ETL, and automations; \\Knowledge of microservice architecture, security, and authentication; \\Experience with databases (PostgreSQL, SQL Server, MongoDB, Redis); \\Familiarity with AWS (Lambda, API Gateway, S3, ECS); \\Experience with logging, monitoring, CI/CD, unit testing, and integration testing. **MJV Benefits:** TotalPass\\Wellhub; ‍‍‍‍ Group life insurance; Meal voucher / Food allowance; Health and dental plan \- Bradesco; Training initiatives: talks, forums, knowledge exchanges, and conversations related to our business. We are constantly connected to learn more—together; \+MJVer Program: internal referral program where you refer a colleague to join us, and if the match is successful, you receive a reward; Partnerships: want discounts? We have a Workplace group where we announce partnerships with educational institutions, language schools, gyms, restaurants, products, and other services.